Device for indicating the temperature in annealing-furnaces



" (No Model.) 7

M.- A. -LHUIS'SIER. DEVICE FOR INDIGATING THE TEMPERATURE IE ANNEAL ING FURNACES No. 292,497. Patented Jan-.29, 1884.

- Inventor. I.

fly V Witnesses.

PATENT Orri cn.

'irroHnL A. LHUISSIER, or BUFFALO,

NEW YORK.'

DEVICE FOR INDICAT ING THE TEMPERATURE IN ANNEA UNG-FU RNAC ES.

SPECIFICATION forming part of Letters Patent No. 292,497, dated January 29, 1834 Application filed May 5,1883. (No model.)

To ctZl whom, it may concern Be it known that I, MIoHnL A. LHUIssIER, a citizen of the Republic of France, having declared my intention to become'a citizen of the United States, residingin Buffalo, inthe county of Erie and State of New York, have invented certain new and useful Improvements in Devices for Indicating the Temperature in Annealing-Furnaces, of which the following is a specification.

Malleable-iron or steel furnaces as heretofore constructed have not been provided with asuitable device for indicating the exact point when the proper degree of heat has been reached within the furnace; hence in large malleableiron works it is not an unusual thing to have large batches of iron spoiled by overheating. The greatest obstacle in the way of an instrument of that kind has been thegreat degree of heat required within the furnace, so that a thermometer for indicating the temperature is soon destroyed by it. v

The object of my invention is to obviate this objection, as will be fully and clearly hereinafter shown by reference to the accompanying drawings, in which- Figure 1 is a front elevation of a malleableiron or steel furnace, showing my device connected thereto, a small portion being in section. Fig. 2 is ahorizontal section through the reducer and indicating device in line X X. Fig. 3 represents a portion of afurnace, showing a side elevation of my device connected thereto in partial section.

a represents an ordinary furnace, or portion of-one, for annealing or preparing malleable iron or steel. It is made in the usual way, of brick or other suitable material.

a a a are the usual doors.

a is the flue. leading from openings in the floor or other suitablepoint to the chimney or smoke-stack a but as this part of the device is old and well known a further description here is unnecessary.

The reducer 0 maybe of any convenient size or form, according tothe size of the furnace to which it is applied. When connected to an ordinary-sized furnace, it may be a hollow device about three feet long by about eighteen inches square; but of course any other form or shape may be used. It is connected the thermometer and lamp.

also provided with a damper or sliding cut-off,

0 At one end or side of the reducer is a small space, 6, for receivlng a lamp, 6', and

next to it is a space for a thermometer, e,

either a mercurial or other suitable thermometer. An instrument similar to the one shown answers the purpose very well.- a glass tube, 6, having the usual index for indicating temperature, and the bent portion 0*, passing into the reducer over the flue c, to receive a portion of the heat passing through it into the flue a. In some cases a metallic thermometerg'e", (see Fig. 8,) constructed in any well-known way, and provided with the usual graduated scale or index, may be used, if required. The reducer and its connections may be applied or attached to any convenient part of the furnace, and, if desired or neces- It consists of sary, it may be inclosed within a room, 6 (see I Fig. 1,) so as to keep the temperature around it as nearly the same as possible, and insome cases it may be desirable to cover the outside with a coating of any well-known non-conducting material. f is a door for inclosing It isprovided with a transparent space, f, through which the thermometermay be seen.

The operation of the invention is as follows: The temperature being raised to the high point required, and all the dampers being opened, it will be seen that a small portion of the heated air passes out of the furnace through the tube 0 into the reducer, through which the heated air passes in the direction of thearrows, through the reducer into the tube or flue c, and in thus passing it loses a large portion of its temperature, so that there is not near as much heat in it when it passes the thermometer as there is within the furnace but the scale or index may be raised so as to indicate the furnace temperature-that is, if the heat in the furnace is five times greater, for instance, than it"is around the thermometer, the index or scale should be raised accordingly, so as to indicate the temperature in the furnace. damper 0" may be closed so as to adjust the amount of reduction of the temperature, and, if desired, it may be shut off altogether, and in some cases either of the dampers o 0" may be closed, or partly closed, or opened, so as to regulate exactly the amount of heat passing through the several flues.

I claim as my invention- 1. The combination, with a furnace, of areducer connected thereto by a tube, and to the main flue of the furnace by a flue, c, and a The I thermometer, substantially as and for the purposes described.

2. The reducer 0, connected to the furnace by a tube, 1:, provided withadamper or valve, 0, in combination with a thermometer and an outlet-tube, 0, connected with the furnace outlet-flue a", the flue a having a damper or valve, 0", as and for the purposes described.

MICHEL A. LHUISSIER.

Witnesses:

J. M. CALDWELL, J urns SANGSTER. 

